nicoderm cq, the patch with time release smart control technology. quit one day at a time with nicoderm cq. >>> investigators are looking into the possibility that a gas leak may have triggered a deadly blast in an indianapolis residential neighborhood. the candlelight vigil was held last night after saturday's night fiery explosion. some residents have been allowed to return many homes in that neighborhood are beyond repair. susan mcginnis reports. >> reporter: crews picked through the rubble of two homes levelled in an explosion in indianapolis. they are trying to determine what caused the powerful blast that killed two people and injured several others. >> the house probably felt like it moved a foot or so. and all we could do was get out of here. >> reporter: officials say the explosion damaged 80 homes and dozens are damaged enough that they may have to be torn down. the fiery blast around 11:00 saturday night left neighbors shocked. >> watching tv and next thing we know we hear this loud explosion and the whole house shook. >> reporter: about 2